题目内容
A long-term ____________ between these natural sources and sinks leads to the background, or natural, level of CO₂ in the atmosphere.
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Human activities increase atmospheric CO₂ levels primarily through the burning of ____________.
The next most significant greenhouse gas is surface, or low-level, _________.
A carbon footprint is composed of two parts, a primary and _____________ footprint.
An important reason that climate change is so dangerous to species is that the extinction of one animal, organism, plankton, or flora, can cause a __________ effect that impacts all of the species involved in that food web.
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